Chapter 2:Fractions, Decimals and Percentages, 2.1:Rounding Numbers

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Last updated 3:19 PM on 9/19/26
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15 Terms

1
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What is rounding?
Changing a number to a simpler value that is close to the original
2
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How do you round to the nearest whole number?
Look at the tenths digit; 5 or more rounds up
3
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What are decimal places?
The number of digits after the decimal point
4
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How do you round to 1 decimal place?
Look at the second decimal digit
5
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How do you round to 2 decimal places?
Look at the third decimal digit
6
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How do you round to 3 decimal places?
Look at the fourth decimal digit
7
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What happens if the next digit is 5 or more?
Round the last digit up by 1
8
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What happens if the next digit is 4 or less?
Leave the last digit unchanged
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What are significant figures?
Important digits starting from the first non-zero digit
10
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How do you round to significant figures?
Keep the required number of significant digits and look at the next digit
11
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Are zeros before the first non-zero digit significant?
No
12
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What is the difference between decimal places and significant figures?
Decimal places count digits after the decimal point
13
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Why is rounding useful?
It makes numbers easier to read
14
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What is estimating?
Finding an approximate answer by rounding numbers before calculating
15
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Why should you avoid rounding too early in a calculation?
It can make the final answer less accurate